Medical devices and methods for making and using the same are disclosed. An example medical device may include a catheter. The catheter may include an elongate flexible catheter body. An expandable structure may be associated with the catheter body and may include a radially expandable balloon and a plurality of flexible circuits extending along an outer surface of the balloon. Each flexible circuit may include at least one electrode and at least one temperature sensor. The expandable structure may have an outer diameter of less than 4 mm when in an expanded configuration.